Low-field non-resonant microwave absorption in glass-coated Co-rich microwires

A study of low-field non-resonant microwave absorption (LFA) at 9.8 GHz, on as-cast amorphous Co-rich CoFeBSi microwires under different measuring geometries is presented. Results confirm that LFA is associated with the magnetization processes from the unmagnetized state (H-DC = 0) to the saturated condition, in many aspects similar to Giant Magnetoimpedance (GMI), and clearly different from ferromagnetic resonance (FMR). LFA signal showed large variations in its maximum-minimum separation as a function of the measuring geometry, which is interpreted in terms of the total anisotropy in the process. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim